Valorificarea talcului cu obţinerea oxidului de magneziu, materie primă pentru producerile cosmetică şi farmaceutică [Articol]

Abstract

Currently, the industrial demand for magnesium oxide (MgO) is ensured by processing natural deposits by dry marl. Among the other varieties of natural raw materials that can supply MgO, but are little used at the industrial level, are silicates. The present paper describes the results of obtaining MgO from talc (Mg3Si4O10(OH)2) natural form of magnesium silicate, by applying a known industrial process, the "wet" process, easily adapted to the raw material. The adjusted "wet" process involves the following steps: 1) dissolving the talc in hydrochloric acid solution; 2) decanting the solution to remove the solid residue (SiO2, etc.); 3) precipitation of Mg(OH)2; 4) separation, by settling process, of the precipitate of Mg(OH)2; 5) decomposition of Mg(OH)2. As a result of the application of the process, an overall process yield of 92.3% was achieved.